diff --git a/t/test-lib-junit.sh b/t/test-lib-junit.sh
new file mode 100644
index 00000000000..9d55d74d764
--- /dev/null
+++ b/t/test-lib-junit.sh
@@ -0,0 +1,126 @@
+# Library of functions to format test scripts' output in JUnit XML
+# format, to support Git's test suite result to be presented in an
+# easily digestible way on Azure Pipelines.
+#
+# Copyright (c) 2022 Johannes Schindelin
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see http://www.gnu.org/licenses/ .
+#
+# The idea is for `test-lib.sh` to source this file when the user asks
+# for JUnit XML; these functions will then override (empty) functions
+# that are are called at the appropriate times during the test runs.
+
+start_test_output () {
+	junit_xml_dir="$TEST_OUTPUT_DIRECTORY/out"
+	mkdir -p "$junit_xml_dir"
+	junit_xml_base=${1##*/}
+	junit_xml_path="$junit_xml_dir/TEST-${junit_xml_base%.sh}.xml"
+	junit_attrs="name=\"${junit_xml_base%.sh}\""
+	junit_attrs="$junit_attrs timestamp=\"$(TZ=UTC \
+		date +%Y-%m-%dT%H:%M:%S)\""
+	write_junit_xml --truncate "<testsuites>" "  <testsuite $junit_attrs>"
+	junit_suite_start=$(test-tool date getnanos)
+	if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
+	then
+		GIT_TEST_TEE_OFFSET=0
+	fi
+}
+
+start_test_case_output () {
+	junit_start=$(test-tool date getnanos)
+}
+
+finalize_test_case_output () {
+	test_case_result=$1
+	shift
+	case "$test_case_result" in
+	ok)
+		set "$*"
+		;;
+	failure)
+		junit_insert="<failure message=\"not ok $test_count -"
+		junit_insert="$junit_insert $(xml_attr_encode "$1")\">"
+		junit_insert="$junit_insert $(xml_attr_encode \
+			"$(if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
+			   then
+				test-tool path-utils skip-n-bytes \
+					"$GIT_TEST_TEE_OUTPUT_FILE" $GIT_TEST_TEE_OFFSET
+			   else
+				printf '%s\n' "$@" | sed 1d
+			   fi)")"
+		junit_insert="$junit_insert</failure>"
+		if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
+		then
+			junit_insert="$junit_insert<system-err>$(xml_attr_encode \
+				"$(cat "$GIT_TEST_TEE_OUTPUT_FILE")")</system-err>"
+		fi
+		set "$1" "      $junit_insert"
+		;;
+	fixed)
+		set "$* (breakage fixed)"
+		;;
+	broken)
+		set "$* (known breakage)"
+		;;
+	skip)
+		message="$(xml_attr_encode "$skipped_reason")"
+		set "$1" "      <skipped message=\"$message\" />"
+		;;
+	esac
+
+	junit_attrs="name=\"$(xml_attr_encode "$this_test.$test_count $1")\""
+	shift
+	junit_attrs="$junit_attrs classname=\"$this_test\""
+	junit_attrs="$junit_attrs time=\"$(test-tool \
+		date getnanos $junit_start)\""
+	write_junit_xml "$(printf '%s\n' \
+		"    <testcase $junit_attrs>" "$@" "    </testcase>")"
+	junit_have_testcase=t
+}
+
+finalize_test_output () {
+	if test -n "$junit_xml_path"
+	then
+		test -n "$junit_have_testcase" || {
+			junit_start=$(test-tool date getnanos)
+			write_junit_xml_testcase "all tests skipped"
+		}
+
+		# adjust the overall time
+		junit_time=$(test-tool date getnanos $junit_suite_start)
+		sed -e "s/\(<testsuite.*\) time=\"[^\"]*\"/\1/" \
+			-e "s/<testsuite [^>]*/& time=\"$junit_time\"/" \
+			-e '/^ *<\/testsuite/d' \
+			<"$junit_xml_path" >"$junit_xml_path.new"
+		mv "$junit_xml_path.new" "$junit_xml_path"
+
+		write_junit_xml "  </testsuite>" "</testsuites>"
+		write_junit_xml=
+	fi
+}
+
+write_junit_xml () {
+	case "$1" in
+	--truncate)
+		>"$junit_xml_path"
+		junit_have_testcase=
+		shift
+		;;
+	esac
+	printf '%s\n' "$@" >>"$junit_xml_path"
+}
+
+xml_attr_encode () {
+	printf '%s\n' "$@" | test-tool xml-encode
+}
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 0f7a137c7d8..e13e1cb9124 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -107,6 +107,12 @@ mark_option_requires_arg () {
 	store_arg_to=$2
 }
 
+# These functions can be overridden e.g. to output JUnit XML
+start_test_output () { :; }
+start_test_case_output () { :; }
+finalize_test_case_output () { :; }
+finalize_test_output () { :; }
+
 parse_option () {
 	local opt="$1"
 
@@ -166,7 +172,7 @@ parse_option () {
 		tee=t
 		;;
 	--write-junit-xml)
-		write_junit_xml=t
+		. "$TEST_DIRECTORY/test-lib-junit.sh"
 		;;
 	--stress)
 		stress=t ;;
@@ -613,7 +619,7 @@ exec 6<&0
 exec 7>&2
 
 _error_exit () {
-	finalize_junit_xml
+	finalize_test_output
 	GIT_EXIT_OK=t
 	exit 1
 }
@@ -723,35 +729,13 @@ trap '{ code=$?; set +x; } 2>/dev/null; exit $code' INT TERM HUP
 # the test_expect_* functions instead.
 
 test_ok_ () {
-	if test -n "$write_junit_xml"
-	then
-		write_junit_xml_testcase "$*"
-	fi
+	finalize_test_case_output ok "$@"
 	test_success=$(($test_success + 1))
 	say_color "" "ok $test_count - $@"
 }
 
 test_failure_ () {
-	if test -n "$write_junit_xml"
-	then
-		junit_insert="<failure message=\"not ok $test_count -"
-		junit_insert="$junit_insert $(xml_attr_encode "$1")\">"
-		junit_insert="$junit_insert $(xml_attr_encode \
-			"$(if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
-			   then
-				test-tool path-utils skip-n-bytes \
-					"$GIT_TEST_TEE_OUTPUT_FILE" $GIT_TEST_TEE_OFFSET
-			   else
-				printf '%s\n' "$@" | sed 1d
-			   fi)")"
-		junit_insert="$junit_insert</failure>"
-		if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
-		then
-			junit_insert="$junit_insert<system-err>$(xml_attr_encode \
-				"$(cat "$GIT_TEST_TEE_OUTPUT_FILE")")</system-err>"
-		fi
-		write_junit_xml_testcase "$1" "      $junit_insert"
-	fi
+	finalize_test_case_output failure "$@"
 	test_failure=$(($test_failure + 1))
 	say_color error "not ok $test_count - $1"
 	shift
@@ -760,19 +744,13 @@ test_failure_ () {
 }
 
 test_known_broken_ok_ () {
-	if test -n "$write_junit_xml"
-	then
-		write_junit_xml_testcase "$* (breakage fixed)"
-	fi
+	finalize_test_case_output fixed "$@"
 	test_fixed=$(($test_fixed+1))
 	say_color error "ok $test_count - $@ # TODO known breakage vanished"
 }
 
 test_known_broken_failure_ () {
-	if test -n "$write_junit_xml"
-	then
-		write_junit_xml_testcase "$* (known breakage)"
-	fi
+	finalize_test_case_output broken "$@"
 	test_broken=$(($test_broken+1))
 	say_color warn "not ok $test_count - $@ # TODO known breakage"
 }
@@ -1049,10 +1027,7 @@ test_start_ () {
 	test_count=$(($test_count+1))
 	maybe_setup_verbose
 	maybe_setup_valgrind
-	if test -n "$write_junit_xml"
-	then
-		junit_start=$(test-tool date getnanos)
-	fi
+	start_test_case_output
 }
 
 test_finish_ () {
@@ -1103,12 +1078,7 @@ test_skip () {
 
 	case "$to_skip" in
 	t)
-		if test -n "$write_junit_xml"
-		then
-			message="$(xml_attr_encode "$skipped_reason")"
-			write_junit_xml_testcase "$1" \
-				"      <skipped message=\"$message\" />"
-		fi
+		finalize_test_case_output skip "$@"
 
 		say_color skip "ok $test_count # skip $1 ($skipped_reason)"
 		: true
@@ -1124,53 +1094,6 @@ test_at_end_hook_ () {
 	:
 }
 
-write_junit_xml () {
-	case "$1" in
-	--truncate)
-		>"$junit_xml_path"
-		junit_have_testcase=
-		shift
-		;;
-	esac
-	printf '%s\n' "$@" >>"$junit_xml_path"
-}
-
-xml_attr_encode () {
-	printf '%s\n' "$@" | test-tool xml-encode
-}
-
-write_junit_xml_testcase () {
-	junit_attrs="name=\"$(xml_attr_encode "$this_test.$test_count $1")\""
-	shift
-	junit_attrs="$junit_attrs classname=\"$this_test\""
-	junit_attrs="$junit_attrs time=\"$(test-tool \
-		date getnanos $junit_start)\""
-	write_junit_xml "$(printf '%s\n' \
-		"    <testcase $junit_attrs>" "$@" "    </testcase>")"
-	junit_have_testcase=t
-}
-
-finalize_junit_xml () {
-	if test -n "$write_junit_xml" && test -n "$junit_xml_path"
-	then
-		test -n "$junit_have_testcase" || {
-			junit_start=$(test-tool date getnanos)
-			write_junit_xml_testcase "all tests skipped"
-		}
-
-		# adjust the overall time
-		junit_time=$(test-tool date getnanos $junit_suite_start)
-		sed -e "s/\(<testsuite.*\) time=\"[^\"]*\"/\1/" \
-			-e "s/<testsuite [^>]*/& time=\"$junit_time\"/" \
-			-e '/^ *<\/testsuite/d' \
-			<"$junit_xml_path" >"$junit_xml_path.new"
-		mv "$junit_xml_path.new" "$junit_xml_path"
-
-		write_junit_xml "  </testsuite>" "</testsuites>"
-		write_junit_xml=
-	fi
-}
-
 test_atexit_cleanup=:
 test_atexit_handler () {
 	# In a succeeding test script 'test_atexit_handler' is invoked
@@ -1193,7 +1116,7 @@ test_done () {
 	# removed, so the commands can access pidfiles and socket files.
 	test_atexit_handler
 
-	finalize_junit_xml
+	finalize_test_output
 
 	if test -z "$HARNESS_ACTIVE"
 	then
@@ -1484,22 +1407,7 @@ fi
 # in subprocesses like git equals our $PWD (for pathname comparisons).
 cd -P "$TRASH_DIRECTORY" || exit 1
 
-if test -n "$write_junit_xml"
-then
-	junit_xml_dir="$TEST_OUTPUT_DIRECTORY/out"
-	mkdir -p "$junit_xml_dir"
-	junit_xml_base=${0##*/}
-	junit_xml_path="$junit_xml_dir/TEST-${junit_xml_base%.sh}.xml"
-	junit_attrs="name=\"${junit_xml_base%.sh}\""
-	junit_attrs="$junit_attrs timestamp=\"$(TZ=UTC \
-		date +%Y-%m-%dT%H:%M:%S)\""
-	write_junit_xml --truncate "<testsuites>" "  <testsuite $junit_attrs>"
-	junit_suite_start=$(test-tool date getnanos)
-	if test -n "$GIT_TEST_TEE_OUTPUT_FILE"
-	then
-		GIT_TEST_TEE_OFFSET=0
-	fi
-fi
+start_test_output "$0"
 
 # Convenience
 # A regexp to match 5 and 35 hexdigits
